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Jupiter is described as a failed star. What did it lack that prevented it from becoming a star?

asked in Jupiter, star, lack

cryptminder answers:

The planet's size creates enormous pressure at its core, producing large amounts of radiation and heat. The core may be as hot as 30,000°C! Radiation belts extend far beyond the planet into space, providing a lethal environment for spacefaring craft venturing too close. The planet also produces a powerful magnetic field. Had the planet been somewhat more massive than it is, it would be a star. There would have been enough pressure, due to gravity, to start nuclear fusion in its core. It would shine with its own light, giving the solar system two stars (a commonly observed occurrence in other parts of the Galaxy). Had this happened, life could not have existed on Earth

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